Question

78+76+81+82+77+80+79+83用简便方法怎么算

Answer 1

【参考答案】

78+76+81+82+77+80+79+83
=80×8+(-2-4+1+2-3+0-1+3)
=640-4
=636

Answer 2

78+76+77=(77+1)+77+(77-1)=77*3

79+80+81=80*3

所以原式=77*3+80*3+82+83
=231+240+165=636

78+76+81+82+77+80+79+83
=78+82+77+83+79+81+（84-4）+76
=160*4-4=640-4
=636

Answer 3

取基准数80:
那么80x8 -2-4+1+2-3+0-1+3=640-4=636